test-drb July 2005

test-drb@ccmp.vtda.org

257 participants
628 discussions

by Richard.Cini＠wachovia.com

The 74LS181 in the middle is a 4-bit ALU. Maybe it displays a mathematical result of some sort? -----Original Message----- From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Vintage Computer Festival Sent: Tuesday, July 12, 2005 11:39 AM To: General Discussion: On-Topic and Off-Topic Posts Subject: Re: Mystery box On Tue, 12 Jul 2005, Stefan wrote: > Can anybody tell me what this little blue box is ? > http://www.xs4all.nl/~rimmer/mysterybox/ Obviously a meter of some sort. Perhapsa histogram? -- Sellam Ismail Vintage Computer Festival ---------------------------------------------------------------------------- -- International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

19 years, 6 months

Power and the RA82

by pete＠dunnington.u-net.com

On Jul 12 2005, 0:43, Tony Duell wrote: > > On a tangential note, is it possible to "lean" on a typical household > > breaker to stop it from tripping? Sort-of-like "battle override" on > > a Navy ship... Or is the lever only good for resetting, and holding > > it will not stop it from tripping? I think the latter but I've never > > tried it for real. > > I have an idea that it's a requirement in the UK that you can't do this > -- if the lever is jammed in the 'on' position, the breaker will still > trip. Certainly alkl those of reputable manufacture behave this way (you > can try holding the lever of an RCD in the 'on' position and pressing the > test button, it will still trip). RCDs are not the same. If you hold the lever of a standard miniature circuit breaker it will not trip. -- Pete Peter Turnbull Network Manager University of York

19 years, 6 months

Anyone want: Canon Microfiche Viewer/Printer, West Yorkshire, UK (move fast!)

by listmailgoeshere＠gmail.com

Hi list, I could grab this if anyone wants it (and can collect it from me soon - I don't have any space to store it, which is why I haven't grabbed it so far). It's called something like Canon PC Printer 80. Despite the name, it appears to have no interfaces at all on it. If anyone wants this, please let me know SOON (including a definite date when you will pick it up from me) and I'll go out and grab it. Don't know anything about the condition of it, I'm afraid. It certainly doesn't look trashed. Ed.

19 years, 6 months

DEC Microfiche question

by rigdonj＠cfl.rr.com

I found some DEC microfiche. A lot of them are marked "LP030A.LIS LOGISTICS.PIC *CONFIDENTAL*". What are they? I don't have a viewer here at home but to the naked eye it looks like some kind of lists. Joe

19 years, 6 months

Z8001/Z8002 CPU

by zahidsolo＠yahoo.com

Dear Joe R Good morning For Z8002 you need Compiler or technique to use it, I have so many Z80 , I try to use it in the begining , but then I shift to 8051 and Atmel AVR microcontrollers, its fine. At tat time I have Cd with compilers for Zilog , If I will look again I may get it again. I worked a lot on microprocessors system. Also I removed these Zilog ICs from some big PC Bords >from scrap. I think some place I have the pin configration and instruction set for Z8002. Also If you want to exchange two three pieces of Z8002 with Z80s then I may also try. Micro controllers have benifit that no connections are required, but they are slower then microprocessor system Regards ZahisZolo __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

19 years, 6 months

Wanted $$ US Source for Commodore PAL Monitor

by marvin＠rain.org

Take a look for a Sony PVM-1271Q Trinitron monitor. I seem to recall that it can take NTSC or PAL inputs. They show up on (ugh) ebay fairly regularly. > I am looking for a color PAL monitor, preferably a Commodore > 1701/1702/1801/1901, but I will take anything that works from this era with > same capabilities I live in the Philadelphia area (USA), I would prefer > to pick up or have shipped from East Coast to save shipping $$. I will pay > fair market value or trade. Please contact me directly. > Thanks. > Bill

19 years, 6 months

Make a New Mylar Keyboard, was Re: Commodore 64-sx Keyboard getting stuck?

by marvin＠rain.org

Since I suspect that the keyboards were originally done by silkscreening conductive ink onto mylar, it should be fairly easy, albeit time consuming, to make a new mylar. My guess would be to use something like a Houston Instrument Pen Plotter that would also take a vinyl cutting knife, cut out the mylar, make up a screen, and just silkscreen the traces onto the ready to insert mylar. Or, if the old mylar is not broken, just reuse the old one. I don't know what kind of prep needs to be done in order for the ink to adhere to the mylar, but this (and anything else that comes up) is something that has been done for a long time. Another thought would be to go to someone who already produces this type of switch and find out what it would cost to make up a couple. It might be possible (depending on the size of the company) to get it done gratis, ie as a sample. > On 7/11/05, Dwight K. Elvey <dwight.elvey at amd.com> wrote: > > If that didn't work, a last resort might > > be to use some small wire wrap wire and melt a channel > > into the plastic layer to keep from deforming the stack > > too much > > I've seen the results of attempts at that. Let me put it this way - > try it right before you are ready to pitch the whole mess. > > there's not enough pressure to make contact between oxidized traces > printed on mylar and any kind of wire. The mylar sheeting is thin > enough that you are more likely to perforate the mylar than "melt a > channel" _Perhaps_ some kind of foil overlay might work, but it would > have to be akin to gold leaf, and you'd need a solder alloy that > melted below the temp of the plastic to get any sort of joint. For > that matter, if you had an uber-low-temp solder (200F? 300F?), you > might be able to overlay entire traces with WW wire, but not if the > plastic develops holes. > > -ethan

19 years, 6 months

Any 3B2/310 owners in here?

by brain＠jbrain.com

This weekend, while picking up a large donation of Commodore equipment (~2000 pounds, the truck springs bottomed out :-), I also secured a 3B2/310. Alas, I'm not at all up on this type of machine. Google brought up some information, but I'd appreciate any personal anecdotes or information. Jim P.S. In other news, the CBM donation was well worth picking up. A prototype Commodore 65 was included. -- Jim Brain, Brain Innovations brain at jbrain.com http://www.jbrain.com Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times!

19 years, 6 months

Wanted $$ US Source for Commodore PAL Monitor

by billdeg＠degnanco.com

I am looking for a color PAL monitor, preferably a Commodore 1701/1702/1801/1901, but I will take anything that works from this era with same capabilities I live in the Philadelphia area (USA), I would prefer to pick up or have shipped from East Coast to save shipping $$. I will pay fair market value or trade. Please contact me directly. Thanks. Bill

19 years, 6 months

Apple 1 on ebay - Well, WAS it an Apple 1??

by ikvsabre＠comcast.net

If we are going to start naming calling every other hobbyist, please let me know so I can terminate my subcription to this group. I find this thread disgusting. -------------- Original message -------------- > I'm sorry, but when 'scarcity' becomes the deciding factor in how > 'interesting' a piece of equipment is to the community, this hobby is > close to becoming another room full of stamp collectors, or worse, Star > Wars 'collectable' fanatics.

19 years, 6 months

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test-drb July 2005